Capacitance type seat occupant sensor system

Inactive Publication Date: 2008-05-01
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]An object of the invention is to provide a capacitance type occupant s

Problems solved by technology

Because the dielectric constant of the water is 80 and close to the dielectric constant of the human body, it is difficult to discriminate the human

Method used

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  • Capacitance type seat occupant sensor system
  • Capacitance type seat occupant sensor system
  • Capacitance type seat occupant sensor system

Examples

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Embodiment Construction

[0035]A capacitance type seat occupant sensor system 1 according to a preferred embodiment of the invention will be described with reference to the appended drawings.

[0036]As shown in FIG. 1, the capacitance type seat occupant sensor system 1 includes a sensor unit 2, a connector 3, an electric power source 8, an impedance detecting unit 14 and an occupant sensing ECU 15. The sensor unit 2 is disposed in a seat of a vehicle.

[0037]The seat has a seat portion 9, a seat back 10 and a seat frame 11. The sensor unit 2 is disposed inside the seat portion 9, and the seat frame 11 is disposed at the bottom of the seat portion 9 to confront the sensor unit 2 at a certain distance. The seat frame 11 is electrically connected to a vehicle body 12.

[0038]As shown in FIG. 2, the sensor unit 2 includes a main electrode 21, a sub-electrode 22 and a guard electrode 23. The main electrode 21 and the sub-electrode 22 are disposed side by side at a certain distance. The guard electrode 23 is disposed b...

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PUM

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Abstract

A capacitance type seat occupant sensor system of a vehicle includes an AC electric power source, a main electrode disposed at a seat of the vehicle to form an electric field between the main electrode and the body of the vehicle, a guard electrode disposed between a seat frame and the main electrode, a switch unit for establishing connection of the guard electrode to have the same potential as the main electrode to provide a seat occupant sensing mode, an impedance calculating unit for calculating an impedance of a sensing circuit based on the AC voltage and an amount of current flowing through the sensing circuit, a real-part-and-imaginary-part calculating unit and judging unit for discriminating an occupant on the seat based on at least the imaginary part of the first impedance. The impedance calculating unit calculates a first impedance of an electric circuit including the main electrode when the switch means provides the seat occupant sensing mode, and the real-part-and-imaginary-part calculating unit calculates the real part and the imaginary part of the impedance.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]The present application is based on and claims priority from Japanese Patent Application 2006-296529, filed Oct. 31, 2006, the contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a capacitance type seat occupant sensor system to be installed in a vehicle.[0004]2. Description of the Related Art[0005]JP-Hei-11-271463-A discloses a seat occupant sensor system that includes a capacitance type sensor and an electronic control system. The capacitance type sensor includes a main electrode disposed inside a seat of a vehicle to detect a change in an electric field that is formed between the main electrode and a portion of a vehicle body.[0006]If no occupant sits on the seat, there is nothing but air in the electric field. If there is a member of a child restraint system (CRS) on the seat, the member intervenes in the electric field. If a passenger s...

Claims

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Application Information

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IPC IPC(8): B60Q1/00B60N2/90
CPCB60N2/002B60R21/01532G01V3/088
Inventor KIRIBAYASHI, SHINICHI
Owner DENSO CORP
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